I'm all for giving VAR a chance but i do think there are still instances where offsides are questionable even with the technology. Video can confirm if somebody is in an offside position, but it would still be a matter of opinion in instances where you have to decide whether or not they're interfering with play. If Sane had been in an offside position yesterday there would probably have been more debate on whether the flag should have gone up.
as i have already said you are putting two together to make one, interfering with play only comes into play once a player is deemed offside, the deciding if a player is offside with today's tech is clear cut